Bug when more than one conversion print is launched within the same libreoffice instance.
The standard behavior of libreoffice when a user open it while another instance is
running is to show a new window and throw an error if a new instance is forced within
the same user installation [see](https://bugs.documentfoundation.org/show_bug.cgi?id=37531).
This implies a bug in report_py3o module when we call libreoffice at the same time for
different documents.
To reproduce this bug:
**Case 1:**
1. Simultaneously print two documents.
**Case 2:**
1. Run print jobs using job_queue module
2. Manually print another document
**Case 3:**
2. Open libreoffice
3. Print a py3o report
This PR creates a temporary user installation for each libreoffice conversion to bypass this limitation.